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Endowing Aspecific, Unbridged-Metallocene Propylene-Polymerization Catalysts with Isospecificity: The Unprecedented Role of MAO

Authors

  • Seong Kyun Kim Dr.,

    1. Department of Chemistry, School of Molecular Science BK-21, Center for Molecular Design and Synthesis http://xray.kaist.ac.kr/
    2. Polyolefin Materials Research Center, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Republic of Korea, Fax: (+82) 42-869-2810
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  • Hwa Kyu Kim,

    1. Department of Chemistry, School of Molecular Science BK-21, Center for Molecular Design and Synthesis http://xray.kaist.ac.kr/
    2. Polyolefin Materials Research Center, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Republic of Korea, Fax: (+82) 42-869-2810
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  • Min Hyung Lee Dr.,

    1. Department of Chemistry, School of Molecular Science BK-21, Center for Molecular Design and Synthesis http://xray.kaist.ac.kr/
    2. Polyolefin Materials Research Center, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Republic of Korea, Fax: (+82) 42-869-2810
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  • Seung Woong Yoon,

    1. Department of Chemistry, School of Molecular Science BK-21, Center for Molecular Design and Synthesis http://xray.kaist.ac.kr/
    2. Polyolefin Materials Research Center, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Republic of Korea, Fax: (+82) 42-869-2810
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  • Youngkyu Do Prof. Dr.

    1. Department of Chemistry, School of Molecular Science BK-21, Center for Molecular Design and Synthesis http://xray.kaist.ac.kr/
    2. Polyolefin Materials Research Center, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Republic of Korea, Fax: (+82) 42-869-2810
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  • The authors are grateful for financial support from CMDS, POMRC, the BK-21 project, and the Honam Petrochemical Co. S.K.K. thanks Mr. H. S. Shin for performing the NMR spectroscopy experiments. MAO=methyl aluminum oxane.

Abstract

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Unbridged yet isospecific metallocene polypropylene catalytic systems can be generated in situ during the MAO-assisted activation step (see picture; MAO=methyl aluminum oxane), as demonstrated with a dimethylaminophenyl-substituted zirconocene that has a racemic, C2-symmetric structure in the solid state and produces highly isotactic polypropylene.

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